161205112 has 32 divisors (see below), whose sum is σ = 316249920. Its totient is φ = 76956160.

The previous prime is 161205103. The next prime is 161205167. The reversal of 161205112 is 211502161.

It is a self number, because there is not a number n which added to its sum of digits gives 161205112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10188 + ... + 20644.

It is an arithmetic number, because the mean of its divisors is an integer number (9882810).

Almost surely, 2^161205112 is an apocalyptic number.

It is an amenable number.

161205112 is a deficient number, since it is larger than the sum of its proper divisors (155044808).

161205112 is a wasteful number, since it uses less digits than its factorization.

161205112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551 (or 10547 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 161205112 is about 12696.6575129047. The cubic root of 161205112 is about 544.2431060922.

Adding to 161205112 its reverse (211502161), we get a palindrome (372707273).

It can be divided in two parts, 16 and 1205112, that added together give a triangular number (1205128 = T₁₅₅₂).

The spelling of 161205112 in words is "one hundred sixty-one million, two hundred five thousand, one hundred twelve".